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Genetic and cellular analyses of zebrafish atrioventricular cushion and valued development.
Development 132, 4193-4204 (2005)
Defects in cardiac valve morphogenesis and septation of the heart chambers constitute some of the most common human congenital abnormalities. Some of these defects originate from errors in atrioventricular (AV) endocardial cushion development. Although this process is being extensively studied in mouse and chick, the zebrafish system presents several advantages over these models, including the ability to carry out forward genetic screens and study vertebrate gene function at the single cell level. In this paper, we analyze the cellular and subcellular architecture of the zebrafish heart during stages of AV cushion and valve development and gain an unprecedented level of resolution into this process. We find that endocardial cells in the AV canal differentiate morphologically before the onset of epithelial to mesenchymal transformation, thereby defining a previously unappreciated step during AV valve formation. We use a combination of novel transgenic lines and fluorescent immunohistochemistry to analyze further the role of various genetic (Notch and Calcineurin signaling) and epigenetic (heart function) pathways in this process. In addition, from a large-scale forward genetic screen we identified 55 mutants, defining 48 different genes, that exhibit defects in discrete stages of AV cushion development. This collection of mutants provides a unique set of tools to further our understanding of the genetic basis of cell behavior and differentiation during AV valve development.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
heart; AV canal; endocardium; notch; calcineurin; zebrafish
Language
english
Publication Year
2005
HGF-reported in Year
0
ISSN (print) / ISBN
0950-1991
e-ISSN
1477-9129
Quellenangaben
Volume: 132,
Pages: 4193-4204
Publisher
Company of Biologists
Reviewing status
Peer reviewed
Institute(s)
Institute of Developmental Genetics (IDG)
POF-Topic(s)
30501 - Systemic Analysis of Genetic and Environmental Factors that Impact Health
PSP Element(s)
G-500100-001
Erfassungsdatum
2005-12-19